S 022-077
(2)
Remove all the battery power.
S 492-072
CAUTION:_______YOU MUST PUT A ESD WRIST STRAP ON YOUR WRIST. YOU MUST CONNECT THE ESD WRIST STRAP TO THE ELECTROSTATIC GROUND RECEPTACLE ON THE WIU RACK. MAKE SURE THE ESD WRIST STRAP IS ON YOUR SKIN. IF THERE IS MATERIAL BETWEEN THE STRAP AND YOUR SKIN, THE GROUND CIRCUIT WILL NOT BE SATISFACTORY. THE ELECTRONIC SHELVES AND THE WIRES ARE CONNECTED TO ELECTROSTATIC SENSITIVE EQUIPMENT. IF YOU DO NOT CORRECTLY USE THE ESD WRIST STRAP, YOU CAN CAUSE MUCH DAMAGE TO THE EQUIPMENT.
(3) Attach a ESD wrist strap to your wrist.
NOTE: The ESD wrist straps are kept in bags at the ends of the
____
WIU racks (Fig. 203).
S 492-054
(4) Attach the ESD wrist strap to the electrostatic ground receptacle on the WIU rack (Fig. 203).
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S 422-055
CAUTION: MAKE SURE THE WIU COVER IS INSTALLED BEFORE YOU INSTALL THE WIU
_______ ON THE SHELF. DAMAGE TO THE WIRE WRAP POSTS AND TO THE WIRES CAN OCCUR IF YOU INSTALL THE WIU WITHOUT THE COVER. DO NOT PERMIT CONTAMINATION IN THE WIU WHEN THE COVER IS OFF. MAKE SURE THAT YOU KEEP CONTAMINATION OR UNWANTED MATERIAL AWAY FROM THE WIU. MAKE SURE THAT OTHER PEOPLE THAT WORK AROUND THE WIU AREA KEEP UNWANTED MATERIAL OR CONTAMINATION AWAY FROM THE WIU. UNWANTED MATERIAL OR CONTAMINATION CAN CAUSE A MALFUNCTION IN THE WIU.
(5)
Put the WIU on the shelf with the shown connector side up (View C, Fig. 203).
S 432-056
(6)
Attach the electrical bonding jumper to the panel.
S 762-057
(9)
Put the retainer in its position at each end of the connector (View D, Fig. 201).
S 422-060
(10)
Install the bolts through the retainers (View D, Fig. 203).
S 412-061
(11)
Put the WIU panel in its position (View B, Fig. 203).
S 412-062
(12)
Install the bolts.
S 712-063
(13)
Do an operational test of the system associated with the WIU you installed.
S 092-064
(14)
Remove the ESD wrist strap from the electrostatic ground receptacle on the WIU rack (Fig. 203).
(7) Do the electrical bond check (AMM 20-22-01/601). maximum resistance is not more than 0.0025 ohm. Make sure the
(8) S 432-058Attach the electrical connectors to the panel.
S 422-059
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S 092-065
(15) Remove the ESD wrist strap from your wrist.
NOTE: Put the ESD wrist strap in an empty bag found at the ends
____
of the WIU racks (Fig. 203).
S 412-066
(16) Install the cargo lining on the aft side of the electronic rack:
(a)
Put the cargo lining in its position.
(b)
Install the bolts.
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747-400 MAINTENANCE MANUAL
STANDARD TORQUE VALUES - MAINTENANCE PRACTICES
______________________________________________
1. General_______
A. This procedures contains this task:
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